I have the same issue on my V60, the sub DSP board I'm told is faulty.
the replacement cost quoted is £157 - far more than its worth
i wonder if anyone knows if this sub PCB for the DSP is the same (interchangeable) as the V20 or V40 ?
(I would buy a V20 cheap for the board)
since the control software and download are the same ??
cheers Steve